西藏色龙西山二叠系-三叠系界线剖面稳定碳同位素特征

安显银; 张予杰; 朱同兴; 张以春; 袁东勋

doi:10.3799/dqkx.2018.103

西藏色龙西山二叠系-三叠系界线剖面稳定碳同位素特征

doi: 10.3799/dqkx.2018.103

1.
中国地质调查局成都地质调查中心, 四川成都 610081
2.
现代古生物学与地层学国家重点实验室, 中国科学院南京地质古生物研究所, 江苏南京 210008

基金项目:

中国地质调查局项目 DD20160018

中国地质调查局项目 DD20160015

中国地质调查局项目 1212011121257

国家自然科学基金项目 41602126

详细信息

作者简介:
安显银(1988-), 男, 硕士, 工程师, 主要从事地层学及沉积学研究

中图分类号: P53;P59
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出版历程
- 收稿日期: 2018-03-17
- 刊出日期: 2018-08-15

Stable Carbon Isotope Characteristics of Permian-Triassic Boundary at the Selong Xishan Section

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Nanjing 210008, China

摘要

摘要: 古生代-中生代之交的生物灭绝过程和原因一直是科学家关注和致力解决的关键古生物学问题之一.色龙西山剖面的牙形石分带工作取得了重要进展，为认识该地区地层序列和沉积历史提供了新的证据.全岩碳同位素分析表明，在长兴阶与印度阶附近该剖面存在着碳同位素负偏，可以同我国华南多个剖面进行对比，揭示了古生代-中生代之交的碳同位素变化和生物灭绝模式具有全球对比性.新识别出的奥伦尼克阶底部（Neospathodus waageni带底部）碳同位素值大幅度负偏及之后的正偏，与华南等地的变化规律一致，反映了二叠纪末期到早三叠世长期的、复杂的生物和环境变化过程.
- 碳同位素 /
- 二叠系-三叠系 /
- 牙形石 /
- 色龙西山 /
- 生物地层 /
- 地球化学 /
- 地层学
Abstract: The process and cause about the mass extinction event across the Paleozoic-Mesozoic transition have always been one of the key paleontological issues in the past few decades. The conodont zoning of the Selong Xishan section has made important progress, providing new evidence for understanding the stratigraphic sequence and sedimentary history of the area. Carbon isotope analyses of bulk samples in this study indicate that there are negative shifts across the Changshingian-Induan Boundary, which are comparable to South China. Newly identified carbon isotope negative shift at earliest Olenekian, base of Neospathodus waageni zone and the following positive shift coincide with the pattern recognized in South China and other places, implying the multi-phase extinction-recovery processes in Early Triassic.
- carbon isotope /
- Permian-Triassic /
- conodont /
- Selong Xishan /
- biostratigraphy /
- geochemistry /
- stratigraphy

HTML全文

图 1 西藏色龙地区地质图及构造位置

据潘桂棠等(2002)修改.Ⅲ2.拉达克-冈底斯-拉萨-腾冲陆块；Ⅲ2-1.昂龙岗日-班戈-腾冲燕山期岩浆弧带；Ⅲ2-4.革吉-措勤晚古生代复合弧后盆地带；Ⅲ2-5.隆格尔-工布江达断隆带；Ⅲ2-6.冈底斯-下察隅晚燕山-喜马拉雅期岩浆弧带；Ⅲ2-7.冈底斯南缘弧前盆地带；Ⅲ3.印度河-雅鲁藏布江结合带；Ⅲ4.印度陆块；Ⅲ4-1.北喜马拉雅特提斯沉积褶冲带；Ⅲ4-2.高喜马拉雅结晶岩带或基底逆冲带；Ⅲ4-3.低喜马拉雅褶冲带；Ⅲ4-4.锡瓦利克厚造山前陆盆地带

Fig. 1. The geological map and tectonic framework of Selong area, Tibet

下载: 全尺寸图片幻灯片

图 2 西藏色龙西山PTB剖面野外露头照片

Fig. 2. Outcrop photographs of PTB at the Selong Xishan section, Tibet

下载: 全尺寸图片幻灯片

图 3 西藏色龙西山剖面牙形石生物地层及δ¹³C_PDB变化曲线

牙形石带划分方案据Yuan et al.(2018)修改

Fig. 3. Conodont biostratigraphy and curves of δ¹³C_PDB at the Selong Xishan section, Tibet

下载: 全尺寸图片幻灯片

图 4 西藏色龙西山剖面产出的典型牙形石

a.Hindeodus parvus，侧视；b.Neospathodus waageni，侧视

Fig. 4. Conodonts from the Selong Xishan section, Tibet

下载: 全尺寸图片幻灯片

图 5 西藏色龙西山剖面与我国华南等地剖面δ¹³C_PDB对比

其余剖面的碳同位素值来自Tong et al.(2007)

Fig. 5. Correlation of δ¹³C_PDB between the Selong Xishan section and other well-studied Lower Triassic sections in South China

下载: 全尺寸图片幻灯片

表 1 色龙西山剖面δ¹³C_PDB和δ¹⁸O_PDB同位素值测试结果

Table 1. The contents of δ¹³C_PDB and δ¹⁸O_PDB at the Selong Xishan section, Tibet

样品	δ¹³C_PDB(‰)	δ¹⁸O_PDB(‰)
TWS(6.55 m)	-0.675	-10.790
TWS(6.2 m)	-0.292	-13.330
TWS(6.0 m)	-0.524	-15.480
TWS(5.8 m)	0.166	-12.598
TWS(5.6 m)	-0.066	-14.623
TWS(5.5 m)	2.658	-11.960
TWS(5.4 m)	1.543	-13.417
TWS(5.2 m)	0.703	-12.420
TWS(5.0 m)	1.677	-12.564
TWS(4.8 m)	-1.465	-19.436
TWS(4.6m)	0.010	-17.250
TWS(4.4m)	1.048	-17.279
TWS(4.2m)	1.872	-16.835
TWS(2.0m)	2.197	-13.831
TWS(1.8m)	2.606	-13.637
TWS(1.6m)	2.190	-13.491
TWS(1.4m)	1.679	-14.679
TWS(1.2m)	1.838	-14.122
TWS(1.0m)	1.937	-13.604
TWS(0.9 m)	2.616	-11.843
TWS(0.8 m)	2.069	-12.972
TWS(0.7 m)	1.697	-13.673
TWS(0.6 m)	1.779	-13.649
TWS(0.5 m)	1.879	-13.753
TWS(0.4 m)	2.026	-12.213
TWS(0.3 m)	2.327	-13.062
TWS(0.2 m)	1.841	-13.069
TWS(0.1 m)	2.125	-13.451
TWS(0.05 m)	2.246	-11.489
TWS(-0.05 m)	1.707	-14.833
TWS(-0.1m)	2.572	-8.907
TWS(-0.2m)	2.869	-10.305
TWS(-0.7m)	2.480	-14.065
TWS(-0.9m)	1.943	-14.371
TWS(-1.1m)	2.236	-15.273
TWS(-1.5m)	2.317	-14.955
TWS(-2.0m)	2.210	-13.206
TWS(-2.5m)	3.150	-13.351

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